PUZZLES - Logical Puzzles

Logical Puzzles

A man has 53 socks in his drawer: 21 identical blue, 15 identical black and 17
identical red. The lights are fused and he is completely in the dark. How many
socks must he take out to make 100 per cent certain he has a pair of black socks?

40 socks.If he takes out 38 socks, although it is very unlikely, it is possible they could all be blue and red. To make 100 per cent certain that he also has a pair of black socks he must take out a further two socks;

17.

A box contains 12 marbles of three different colours green, yellow and blue-4 each, If you were to close your eyes and pick them at random, how many marbles must you take out to be sure that there are at least two of one colour among the marbles picked out?